#!/usr/bin/perl -w

# Created by P.Wieleba@iem.pw.edu.pl in 2004

use strict;
use Getopt::Std;
use FindBin;
use FindBin qw($RealBin);
use lib "$RealBin/";
use smbldap_tools;

# function declaration
sub exist_in_tab;
sub add_to_tab;

# smbldap-migrate-unix-groups (-? or -h for help)
#
#

my %Options;

my $ok = getopts('G:nv?ha', \%Options);

if ( (!$ok) || ($Options{'?'}) || ($Options{'h'}) || (!keys(%Options)) ) {
  print "Usage: $0 [-Gnv?ha]\n";
  print "  -?|-h      show this help message\n";
  print "  -G file    import group file\n";
  print "  -v         displays modified entries to STDOUT\n";
  print "  -n         do everything execpt updating LDAP\n";
  print "  -a         adds sambaGroupMapping objectClass\n";
  exit (1);
}

my $INFILE = undef;

if ( $Options{'G'} ) {
  open($INFILE,$Options{'G'}) or
    die "I cannot open file: " . $Options{'G'} . "\n";
}

my $ldap_master=connect_ldap_master();

while ( my $line=<$INFILE> ) {
  chop($line);
  next if ( $line =~ /^\s*$/ ); # whitespace
  next if ( $line =~ /^#/ );
  next if ( $line =~ /^\+/ );
  my $entry = undef;
  if ($Options{'G'}) {
    my($group, $pwd, $gid, $users) = split(/:/,$line);
    # if user is not in LDAP new entry will be created
    $entry = get_group_entry($ldap_master,$group);
    $entry = migrate_group($entry,$group, $pwd, $gid, $users);
  }
	
  if ($entry) {
    # if used "-a" and sambaGroupMapping doesn't exist.
    if ( $Options{'a'} and !exist_in_tab([$entry->get_value('objectClass')],'sambaGroupMapping') ) {
      my @objectClass = $entry->get_value( 'objectClass' );
      $entry->replace( 'objectclass' => [add_to_tab(\@objectClass,'sambaGroupMapping')] );

      # the below part comes from smbldap-groupadd and
      # maybe it should be replaced by a new subroutine.
      my $groupGidNumber = $entry->get_value('gidNumber');
      # as rid we use 2 * gid + 1001
      my $group_rid = 2*$groupGidNumber+1001;
      # let's test if this SID already exist
      my $group_sid = "$config{SID}-$group_rid";
      my $test_exist_sid=does_sid_exist($group_sid,$config{groupsdn});
      if ($test_exist_sid->count == 1) {
	warn "Group SID already owned by\n";
                                # there should not exist more than one entry, but ...
	foreach my $entry ($test_exist_sid->all_entries) {
	  my $dn= $entry->dn;
	  chomp($dn);
	  warn "$dn\n";
	}
      } else {
	$entry->replace( 'sambaSID' => $group_sid );
	$entry->replace( 'sambaGroupType' => group_type_by_name('domain') );
      }
    }

    if ($Options{'v'}) {
      $entry->dump();
    }
    if (!$Options{'n'}) {
      my $mesg = $entry->update($ldap_master);
      if ($mesg->is_error()) {
	print "Error: " . $mesg->error() . "\n";
      }
    }

  }
}

$INFILE and close($INFILE);
# take down the session
$ldap_master and $ldap_master->unbind;

# returns updated $entry
sub migrate_group
  {
    my($entry,$group, $pwd, $gid, $users) = @_;

    # posixGroup MUST ( cn $ gidNumber )
    my @objectClass = $entry->get_value( 'objectClass' );
    $entry->replace( 'objectClass' => [add_to_tab(\@objectClass,'posixGroup')] );

    $entry->replace( 'cn' => $group );
    ($pwd)       and $entry->replace( 'userPassword'  => "{crypt}" . $pwd );
    ($gid ne "") and $entry->replace( 'gidNumber'     => $gid );

    my @users = split(',',$users);
    # choose only unique users
    my %unique_users;
    foreach my $user (@users) {
      $unique_users{$user} = 1;
    }
    @users = keys(%unique_users);
    ($users) and $entry->replace( 'memberUid' => [ @users ] );

    return $entry;
  }

# creates a _new_entry_ if group doesn't exist in ldap
# else return's ldap user entry
sub get_group_entry
  {
    my($ldap_master,$group) = @_;
	
    # do not use try read_user_entry()
    my $mesg = $ldap_master->search( base => $config{groupsdn},
				     scope => 'one',
				     filter => "(cn=$group)"
				   );
    my $entry;
    if ( $mesg->count() != 1 ) {
      $entry = Net::LDAP::Entry->new();
      $entry->dn("cn=$group,$config{groupsdn}");
    } else {
      $entry = $mesg->entry(0); # ????
    }
    return $entry;
  }

# Check if a $text element exists in @table
# eg. exist_in_tab(\@table,$text);
sub exist_in_tab
  {
    my($ref_tab,$text) = @_;
    my @tab = @$ref_tab;

    foreach my $elem (@tab) {
      if ( lc($elem) eq lc($text) ) {
	return 1;
      }
    }
    return 0;
  }

# Add $text to tab if it doesn't exist there
sub add_to_tab
  {
    my($ref_tab,$text) = @_;
    my @tab = @$ref_tab;
	
    if ( !exist_in_tab(\@tab,$text) ) {
      push(@tab,$text);
    }
    return @tab;
  }


########################################

=head1 NAME

smbldap-migrate-unix-groups - Migrate unix groups to LDAP

=head1 SYNOPSIS

smbldap-migrate-unix-groups [-G file] [-n] [-v] [-h] [-?] [-a]

=head1 DESCRIPTION

This command processes one file as defined by option and
creates new or changes existing ldap group entry.
New attributes are added, and existing are changed.
None of the existing attributes is deleted.

-G group_file
       Processes group_file and uptades LDAP. Creates new ldap group
       entry or just adds posixGroup objectclass and corresponding
       attributes to the ldap group entry or just uptades their values.

-h     show the help message

-?     the same as -h

-v     displayes modified entries to STDOUT

-n     do everything execpt updating LDAP. It is useful when used
       with -v switch.

-a     adds sambaGroupMapping objectClass, generates sambaSID
       and adds sambaGroupType attribute

=cut

#'

# The End